Because she learned that he had been carrying on an affair with LeAnn Rimes. Yikes.

He then went on to marry LeAnn, who became the stepmother to Brandi’s children, Mason and Jake.

To make matters worse, LeAnn has appeared to stoke the flames of Brandi’s distress multiple times over the years, with social media posts featuring Brandi’s children that seemed designed to rub Brandi’s nose into all that she was missing.